Heartleaf for Skin: What the Research Really Says About This K-Beauty Favorite

Heartleaf (Houttuynia cordata) has become one of the most recognizable botanical ingredients in Korean skincare.

Toners advertise 77% heartleaf. Creams use it as the first ingredient. Serums designed for sensitive or blemish-prone skin often place Houttuynia cordata front and center.

Its popularity can make heartleaf seem like a well-established dermatological active ingredient. The science, however, is more nuanced.

Houttuynia cordata contains a variety of phytochemicals, including flavonoids such as quercitrin and hyperoside. Laboratory research has investigated the plant's antioxidant, anti-inflammatory, antimicrobial, and UV-related activities.

But much of this evidence comes from laboratory, cell, and animal research rather than large human clinical trials of everyday heartleaf cosmetics.

That doesn't make heartleaf meaningless. It means the ingredient is better understood as a supportive botanical with interesting biological research rather than a proven treatment for acne, redness, or a damaged skin barrier.

What Makes Heartleaf Interesting for Skin?

Heartleaf's scientific name is Houttuynia cordata, an edible plant with a long history of traditional use in parts of East and Southeast Asia.

Modern research has identified numerous compounds in the plant, including flavonoids and volatile compounds. Among those receiving attention in skin research are quercitrin and hyperoside.

A laboratory study examined Houttuynia cordata extract and two flavonoids in human keratinocytes exposed to UVB radiation. Researchers reported effects involving oxidative stress, inflammatory mediators, and signaling pathways associated with the cellular response to UVB damage.

This provides a biological rationale for heartleaf's reputation as a calming botanical.

But it also illustrates one of the most important distinctions to understand when shopping for heartleaf skincare:

Showing anti-inflammatory activity in cells is not the same as proving that a heartleaf toner will visibly reduce redness in people.

The finished formula, the extract's concentration and composition, other ingredients, and actual human exposure all matter.

What Does the Research Say About Heartleaf and Acne-Prone Skin?

Heartleaf is now strongly associated with oily and blemish-prone Korean skincare, but this is another area where marketing can move faster than clinical evidence.

Laboratory research has investigated Houttuynia cordata extracts for antimicrobial and anti-inflammatory properties relevant to acne. Research evaluating different extracts has also identified multiple phytochemicals that may contribute to these effects.

There is some emerging human research as well.

One study developed a facial toner containing Houttuynia cordata extract and compared it with an extract-free toner. After eight weeks, the researchers reported a statistically significant reduction in measured facial sebum in the heartleaf group.

That's useful evidence, but it isn't enough to classify heartleaf alongside established acne treatments.

For blemish-prone skin, the most reasonable role for heartleaf is as a supportive ingredient within the routine, particularly when someone wants lightweight skincare without relying on the botanical itself to treat acne.

Does More Heartleaf Mean a Better Product?

Korean heartleaf products often make concentration unusually visible:

77% Heartleaf, 70% Heartleaf, 5% Heartleaf.

Those numbers can be useful because they help show how prominently a heartleaf material is used in a particular formula.

They don't create a clinical potency scale.

For example:

77% heartleaf extract does not mean 77% quercitrin.

Nor do we have established clinical evidence showing that a product containing 77% heartleaf must provide greater soothing effects than a well-designed formula containing 5%.

Botanical extracts themselves can also differ depending on the plant material, extraction method, processing, and chemical composition.

So instead of asking:

“Which product contains the most heartleaf?”

a more useful shopping question is:

“What does the rest of this formula add to the job I want it to do?”

That changes how products with very different heartleaf percentages should be compared.

What to Look for in a Heartleaf Formula

For lightweight daily skincare: A toner with heartleaf prominently represented can provide an easy leave-on step without adding a rich layer.
For dehydration: Look beyond heartleaf percentage for humectants such as glycerin and hyaluronic acid.
For dry skin: Ceramides, panthenol, emollients, and the overall moisturizer base may matter more than simply choosing the largest heartleaf number.
For blemish-prone skin: Heartleaf can complement a gentle routine, but don't assume it replaces established acne ingredients when those are needed.
For sensitive skin: Evaluate the complete formula. A botanical marketed as “calming” doesn't automatically make every product suitable for reactive skin.

Korean Skincare Formulas Worth Considering

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Product Name	Best For	Formula Details	Key Feature
ANUA Heartleaf 77% Soothing Toner	Sensitive, Combination & Acne-Prone Skin	77% heartleaf, 1st ingredient	Lightweight, Watery Texture
Abib Heartleaf Calming Toner Skin Booster	Sensitive and Dehydrated Skin	5% heartleaf, 2nd Ingredient	+ Centella Asiatica & Hyaluronic Acid
ONE THING Houttuynia Cordata Serum	Sensitive, Acne-Prone Skin & Daily Environmental Stress	Houttuynia Cordata Powder, 7th Ingredient	Fragrance-Free, + 8 Types of Hyaluronic Acid
Anua Heartleaf 70 Intense Calming Cream	Very Dry and Sensitive Skin	70% heartleaf, 1st ingredient	+ Ceramide NP & Panthenol

For Lightweight Daily Heartleaf Care: ANUA Heartleaf 77% Soothing Toner

• Best for: Combination or oily skin looking for a lightweight, heartleaf-focused toner

The defining feature of ANUA Heartleaf 77% Soothing Toner is straightforward: Houttuynia Cordata Extract makes up 77% of the formula and appears first on the ingredient list.

That confirms heartleaf is a substantial part of the formula, not just a botanical appearing near the end of the ingredient list.

Its watery texture also gives the product a clear role. It provides a lightweight leave-on step for those who want heartleaf without the richness of another serum or moisturizer.

Choose this one if your priority is having heartleaf prominently represented in a lightweight daily toner.

• Where to buy: Amazon and Ulta

For Heartleaf Plus Hydration: Abib Heartleaf Calming Toner Skin Booster

• Best for: Dehydrated skin looking for heartleaf alongside additional hydrating ingredients

Houttuynia Cordata Extract is listed at 5% (50,000 ppm) as the second ingredient after water.

That number is considerably lower than ANUA's 77%, but this is exactly why percentage alone shouldn't determine the choice.

The formula also combines heartleaf with Centella Asiatica and hyaluronic acid, shifting the emphasis toward hydration and skin comfort rather than simply maximizing heartleaf content.

Choose this over a higher-percentage heartleaf toner when supporting hydration matters more to you than the largest heartleaf number on the label.

• Where to buy: Amazon

For a Hydrating Serum Step: ONE THING Houttuynia Cordata Serum

• Best for: Dehydrated skin that wants heartleaf in a serum rather than another toner

In ONE THING Houttuynia Cordata Serum, Houttuynia Cordata Powder appears as the seventh ingredient.

The more important distinction is what surrounds it.

The serum combines heartleaf with eight forms of hyaluronic acid, making layered humectant hydration an important part of the formula. It is also formulated without added fragrance.

That gives this product a different reason to exist in the routine than a high-heartleaf watery toner.

Choose this one when a hydrating serum format and multiple forms of hyaluronic acid fit your routine better than another heartleaf-focused toner.

• Where to buy: Amazon

For Dry Skin and Barrier Support: Anua Heartleaf 70 Intense Calming Cream

• Best for: Dry or easily uncomfortable skin that needs a richer moisturizing step

ANUA Heartleaf 70 Intense Calming Cream contains 70% Houttuynia Cordata Extract as its first ingredient, but heartleaf isn't the only reason this formula works for dry skin.

The cream also contains Ceramide NP and panthenol.

These ingredients have clearer moisturizing and barrier-supporting roles: ceramides contribute to the skin's lipid barrier, while panthenol provides humectant and skin-conditioning support.

That makes this product fundamentally different from choosing a heartleaf toner based primarily on botanical concentration.

Choose the cream when moisture retention and barrier support matter more than adding another lightweight heartleaf layer.

• Where to buy: Amazon

Ingredients That Pair Well with Heartleaf

Heartleaf works particularly well as a supporting botanical alongside ingredients with more clearly established skincare functions:

Panthenol — Adds moisturizing and skin-conditioning support, particularly useful in routines containing stronger actives.
Ceramides — Help maintain the skin's lipid barrier and reduce moisture loss.
Hyaluronic Acid — Provides humectant hydration without depending on heartleaf itself to do the moisturizing work.
Centella Asiatica — Adds a different botanical profile frequently used in formulas designed for skin comfort.
Niacinamide — Provides evidence-based support for barrier function, uneven-looking tone, and sebum regulation.

Nutrients That Support Healthy Skin

Protein — Provides amino acids needed for normal tissue maintenance and structural proteins.
Vitamin C — Supports normal collagen formation and contributes to antioxidant protection.
Zinc — Supports normal cell division, protein synthesis, and wound healing.

Frequently Asked Questions

Is heartleaf proven to reduce redness?
Laboratory research shows anti-inflammatory activity in Houttuynia cordata and some of its flavonoids, but evidence from human clinical trials of ordinary heartleaf cosmetics remains limited.

Is heartleaf good for acne-prone skin?
It can fit well into a blemish-prone routine. Heartleaf has laboratory research on inflammation and acne, along with limited human research on facial sebum, but it shouldn't automatically replace established acne treatments.

Can I use heartleaf with retinoids or exfoliating acids?
Generally, yes. Heartleaf itself typically doesn't need to be separated from retinoids, salicylic acid, AHAs, niacinamide, or vitamin C. Whether the full routine is comfortable depends on the specific formulas and your skin's tolerance.

Is heartleaf better than Centella Asiatica or green tea?
There is no evidence-based reason to declare one universally better. Heartleaf is interesting for its flavonoids and emerging anti-inflammatory research, while green tea has a stronger human evidence base in areas including topical catechins, sebum, and acne. Centella Asiatica has its own triterpenoid chemistry and research history. Choose based on the role you want the product to play, rather than treating all three as interchangeable “soothing” botanicals.

Sources & Further Reading

• Hyperoside and Quercitrin in Houttuynia cordata Extract Attenuate UVB-Induced Human Keratinocyte Cell Damage and Oxidative Stress via Modulation of MAPKs and Akt Signaling Pathway
Laboratory research examining Houttuynia cordata extract and two of its major flavonoids, hyperoside and quercitrin, in UVB-exposed human keratinocytes, including effects on oxidative damage and inflammatory mediators.
Source: Antioxidants

• Anti-Aging, Anti-Acne, and Cytotoxic Activities of Houttuynia cordata Extracts and Phytochemicals Analysis by LC-MS/MS
Laboratory research examining different Houttuynia cordata extracts, their phytochemical profiles, and in vitro activities relevant to acne and skin aging.
Source: Cosmetics

• Development and Clinical Efficacy Evaluation of Facial Toner Containing Houttuynia cordata Thunb
Human research comparing a heartleaf-containing experimental toner with an extract-free formulation, including measurements of facial sebum and skin moisture.
Source: Cosmetics

• Houttuynia cordata Thunb: An Ethnopharmacological Review
A broader peer-reviewed review of the plant's traditional uses, chemical constituents, pharmacological research, and evidence base, including its flavonoids, volatile oils, and anti-inflammatory research. Source: Frontiers in Pharmacology

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